Solutions
Wall Crack Repair
Fix structural wall cracks permanently with HelicalBar™ reinforcement — no walls knocked down. Ever.
- Free assessment · 1–2 day repair · 20-year warranty
- Structural Engineers · Licensed Builders · Skilled Technicians
Trustpilot
GoogleSolutions
Wall Crack Repair
Fix structural wall cracks permanently with HelicalBar™ reinforcement — no walls knocked down. Ever.
- Free quote · 1–2 day repair · 20-year warranty
- Structural Engineers · Licensed Builders · Skilled Technicians
Wall Crack Repair
Fix structural wall cracks permanently with HelicalBar™ reinforcement — no walls knocked down. Ever.
- Free structural assessment with a fixed-price quote
- No walls knocked down — most wall crack repairs done in 1–2 days
- 20-year product and workmanship warranty
Structural Engineers · Licensed Builders · Skilled Technicians
TrustpilotGoogleWhy repairing wall cracks structurally is essential
Sometimes, the wall cracks in your home are cosmetic — a bit of filler and paint sorts them out. Other times, they're telling you something structural has changed — the ground has moved, bricks have expanded, or the ties holding the wall together have failed. Each type looks different.
Here's what most homeowners don't realise: a home's walls carry the weight of the roof, the floors, and everything above — that load needs to spread evenly through the whole structure. When a structural crack opens, the wall breaks into two separate pieces that move independently. Underpinning stops the ground, repointing treats the surface — but neither reconnects the wall.
Wall crack repair ties those sections back together at depth — the wall works as one unit again, stronger than before. Done in 1–2 days, at a fraction of the cost of knocking down and rebuilding.
Which wall cracks are structural?
Against popular belief, not every structural crack needs underpinning. The crack type determines the fix — and that’s why getting an expert out matters.
Settlement Cracks
The least concerning of the four. Every new home settles as the ground compresses under its weight — that’s normal. Sometimes a home over-settles, and small cracks keep growing. If the house is relatively new and the cracks are minor, filling and monitoring is the right call. Once they’re past 5mm, they need looking at. Rarely needs underpinning — usually a wall crack repair sorts it.
Expansion Cracks
Clay bricks expand over their lifespan as they absorb moisture — sometimes several millimetres over decades. The expanding masonry pushes outward against fixed points: corners, window openings, adjoining walls. This is never a foundation issue — underpinning won’t help. The fix is a wall crack repair coupled with an expansion joint, giving the materials room to move as the building ages.
Subsidence Cracks
One area of the foundation sinks more than the rest — technically called differential movement. The ground beneath that section can no longer carry the home’s load, and the wall above cracks as the two sections pull apart. These often need both a foundation repair and a structural wall crack repair — stabilising the ground stops the movement, reinforcing the wall reconnects the structure.
Heave Cracks
The lesser-known crack type. Heave cracks open and close with the seasons — and sometimes close too far, crushing the mortar. Usually caused by excess water beneath the house, often a leak nobody knows about. This is never a foundation repair. The building will always move to some degree — the fix is controlling that movement with expansion joints and wall crack repair to keep loads evenly spread.
Which wall cracks are structural?
The traditional ways of wall crack repair a home
Each method works in the right situation. But each comes with trade-offs worth understanding before you commit.
Crack Filling and Repointing
Mortar or filler is pushed into the crack and the joints repointed. It works for cosmetic hairline cracks where no structural movement is involved. The trade-off: if the wall is still moving — whether from foundation settlement, brick expansion, or failed ties — the crack comes back. Often wider. Fill, paint, repeat.
Knock Down and Rebuild
The cracked section of wall is demolished and rebuilt with new bricks on new mortar. It works — but it’s a major job. Depending on the area, bricklayers can take weeks. And if the wall moved because the ground moved, the new wall faces the same forces unless the root cause is fixed first.
Brick Replacement
A section of cracked brickwork is cut out and replaced with new bricks and fresh mortar. It works where the damage is localised and the bricks themselves have failed. The trade-off: it’s time-consuming, matching bricks can be hard to source, and if the underlying cause hasn’t been fixed, the new brickwork faces the same forces that cracked the original.
Standalone Underpinning
Underpinning stabilises the ground beneath the footings — and when the foundation has moved, that matters. But it doesn’t fix the cracked wall above. The weight of the roof and floors needs to spread evenly through the structure — a cracked wall can’t do that. Foundation repair stops the movement. Wall crack repair reconnects the wall so it carries load as one unit again.
The common ways to repair wall cracks
Our wall crack repair solution – HelicalBar™
Non-Invasive. Permanent. Guaranteed.
No Walls Knocked Down. No Bricks Replaced. Ever.
Underpinning stops the ground moving. Repointing fills the surface. But the wall is still broken — still two separate pieces that can't share load. Reconnecting them is what structural wall crack repair does, and it's what HelicalBar™ was designed for.
Narrow slots are cut into the mortar joints along the crack line. HelicalBar™ R304 stainless steel bars — around 100 times tougher than the bricks themselves — are bonded into the brickwork with structural grout. The bars extend across the crack and several metres beyond it, tying the damaged section back to solid masonry — spreading your home's weight evenly again, the way it was designed to.
What was the weakest point in your wall becomes the strongest. The whole job typically takes 1–2 days. When it's done, the cracks are filled, the mortar repointed, and the finish colour-matched so you'd barely know the wall crack repair happened.
Not sure if your walls need reinforcing, your foundation stabilising, or both? That's exactly what the free assessment answers.
What to expect
How the wall crack repair process works — from assessment to warranty.
Step 1Free Structural Assessment
A Buildfix engineer inspects your home, measures the cracks, identifies the root cause, and designs a wall crack repair plan on-site. Measurements, photos, and markings are recorded using mobile software — and the price is usually explained there and then.
Step 2Get Your Quote and Book
A complete quote package arrives — detailed drawings, repair method statement, and a fixed-price quote. The price you see is the price you pay. When you’re ready, book through the online portal and suitable dates are organised for the wall crack repair.
Step 3Cut Slots and Install HelicalBars™
Narrow slots are cut into the mortar joints along the crack line. HelicalBar™ stainless steel bars are bonded into the brickwork with high-strength structural grout, reconnecting the cracked masonry at depth. No bricks removed. No walls knocked down.
Step 4Finish and Clean Up
Once the HelicalBars™ are installed, the cracks are filled, mortar repointed, and brickwork colour-matched — or render and plaster blended for a smooth, uniform finish. The site is cleaned and your home left spotless.
Step 5Receive Your Warranty
Your 20-year product and workmanship warranty arrives via email with the Completion Package — a job report covering the work, materials, and images.
See the difference
Actual HelicalBar™ wall crack repairs — before and after.
Structural fix.
Guaranteed to last.
The benefits of HelicalBar™ wall crack repair.
HelicalBar™ stainless steel bars are bonded into the mortar joints, reconnecting the cracked masonry as a single structural unit. The wall is stronger than it was before the crack appeared. It works in a uniform manner again — loads spread evenly and distributed through the foundations as designed.
Ready for a wall crack repair that structurally reinforces your walls? Book your free assessment to get started.
Real homes. Real results.
15,000+ homes and structures repaired. Want to see real Buildfix wall crack repair projects? Browse a few below.
HomeownerStrathfield, NSW
Heritage Home Repaired Twice, Same Team
When new cracks appeared in this 150-year-old Strathfield home, the owner didn’t hesitate — they called Buildfix again. Buildfix had already fixed the front of the house years earlier. This time, the team tackled the rear.
HomeownerRandwick, NSW
Hidden Downpipe Behind 10 Years of Cracks
A neighbour’s redirected downpipe quietly washed out the soil beneath this Randwick home for over a decade. Buildfix found the cause, stabilised the ground, and reconnected the cracked walls — no demolition required.
HomeownerWindsor, VIC
Wall Cracks Traced to a Hidden Void
Every expert said “seasonal movement.” But the cracks kept spreading — including right above a child’s bed. Buildfix found the real cause: years of driveway runoff had quietly washed out the ground beneath the walls.
HomeownerSt Kilda, VIC
Bungalow Repaired After 2021 Earthquake
After the 2021 Melbourne earthquake left an 80-year-old California Bungalow with cracked arches and shifting foundations, Buildfix repaired the damage in just three days — without removing a single brick.
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
Questions?
Our team is here to answer any questions you may have Monday – Friday 8am to 4pm AEST. Give us a call on 1300 854 115.
